单项选择题

The roles expected ______ old people in such a setting give too few psychological satisfactions for normal happiness.

A.of
B.on
C.to
D.with
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单项选择题
Doctors see a connection between increased amounts of leisure time spent ______ and the increased number of cases of skin cancer.
A.to sunbathe
B.to have sunbathed
C.having sunbathed
D.sunbathing
单项选择题
Christie stared angrily at her boss and turned away, as though ______ out of the office.
A.went
B.gone
C.to go
D.would go
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